
jQuery.extend({
    createUploadIframe: function(id, uri)
    {
        //create frame
        var frameId = 'jUploadFrame' + id;
        var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
        if(window.ActiveXObject)
        {
            if(typeof uri== 'boolean'){
                iframeHtml += ' src="' + 'javascript:false' + '"';
            }
            else if(typeof uri== 'string'){
                iframeHtml += ' src="' + uri + '"';
            }	
        }
        iframeHtml += ' />';
        jQuery(iframeHtml).appendTo(document.body);
        return jQuery('#' + frameId).get(0);			
    },
    createUploadForm: function(id, fileElementId, data)
    {
        //create form	
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
        jQuery(".update-dialog-content input").each(function(){            
            var elementForm = jQuery(this).clone();
            if(jQuery(this).attr('type')=='file')
            {
                var oldElement = jQuery(this);                
                jQuery(oldElement).before(elementForm);
                jQuery(oldElement).appendTo(form);
            }
            else
            {
                jQuery(elementForm).appendTo(form);
            }
        });
        jQuery.each(jQuery(".update-dialog-content select"), function() {
            var elementForm = jQuery(this).clone();
            elementForm.val(this.value);
            jQuery(elementForm).appendTo(form);
        });
        jQuery.each(jQuery(".update-dialog-content textarea"), function() {
            var elementForm = jQuery(this).clone();
            elementForm.val(this.value);
            jQuery(elementForm).appendTo(form);
        });
        
        jQuery.each((data), function(index, value) {
            jQuery('<input type="hidden" name="' + index + '" value="' + value + '" />').appendTo(form);            
        });
         
//        var oldElement = jQuery('#' + fileElementId); 
//        var newElement = jQuery(oldElement).clone();
//        jQuery(oldElement).attr('id', fileId);
//        jQuery(oldElement).before(newElement);
//        jQuery(oldElement).appendTo(form);
        
        //set attributes
        jQuery(form).css('position', 'absolute');
        jQuery(form).css('top', '-1200px');
        jQuery(form).css('left', '-1200px');
        jQuery(form).appendTo('body');
        return form;
    },
    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()        
        var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));                
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;		
        // Watch for a new set of requests
        if (s.global && ! jQuery.active++ )
            jQuery.event.trigger( "ajaxStart" );
        var requestDone = false;
        // Create the request object
        var xml = {}   
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        var uploadCallback = function(isTimeout)
        {			
            var io = document.getElementById(frameId);
            try 
            {				
                if(io.contentWindow)
                {
                    xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                    xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
                }else if(io.contentDocument)
                {
                    xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                    xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
                }						
            }catch(e)
            {
                jQuery.handleError(s, xml, null, e);
            }
            if ( xml || isTimeout == "timeout") 
            {				
                requestDone = true;
                var status;
                //try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if ( status != "error" )
                    {                        
                        // process the data (runs the xml through httpData regardless of callback)                         
                        var data = $.uploadHttpData( xml, s.dataType );   
                        //var data = '123';
                        // If a local callback was specified, fire it and pass it the data
                        if ( s.success )
                            s.success( data, status );
                        // Fire the global callback
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
                    {
                        jQuery.handleError(s, xml, status);                        
                    }
                //}
//                catch(e) 
//                {
//                    status = "error";
//                    //jQuery.handleError(s, xml, status, e);
//                }
                // The request was completed
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );
                // Handle the global AJAX counter
                if ( s.global && ! --jQuery.active )
                {
                    jQuery.event.trigger( "ajaxStop" );                    
                }
                // Process result
                if ( s.complete )
                {                   
                    s.complete(xml, status);                    
                }
                jQuery(io).unbind()
                setTimeout(function()
                {
                    try 
                    {
                        jQuery(io).remove();
                        jQuery(form).remove();	
                    } catch(e) 
                    {
                        jQuery.handleError(s, xml, null, e);
                    }									
                }, 100)
                xml = null
            }            
        }
        // Timeout checker
        if ( s.timeout > 0 ) 
        {
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);            
        }
        try 
        {
            var form = jQuery('#' + formId);
            jQuery(form).attr('action', s.url);
            jQuery(form).attr('method', 'POST');
            jQuery(form).attr('target', frameId);
            if(form.encoding)
            {
                jQuery(form).attr('encoding', 'multipart/form-data');      			
            }
            else
            {	
                jQuery(form).attr('enctype', 'multipart/form-data');			
            }			
            jQuery(form).submit();

        } catch(e) 
        {			
            jQuery.handleError(s, xml, null, e);            
        }
        jQuery('#' + frameId).load(uploadCallback);
        return {
            abort: function () {}
        };	
    },
    uploadHttpData: function( r, type ) {    
        var data = !type;        
        data = type == "xml" || data ? r.responseXML : r.responseText;
//        // If the type is "script", eval it in global context
//        if ( type == "script" )
//            jQuery.globalEval( data );
//        // Get the JavaScript object, if JSON is used.
//        if ( type == "json" )
//            eval( 'data = ' + data );
//        // evaluate scripts within html
//        if ( type == "html" )
//            jQuery("<div>").html(data).evalScripts();
        return data;
    }
})

